Signals (iOS app)

See who opens your emails

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Nick Frost@thinker · Co-Founder & Partner at Blocknauts.
@dshan Similar to Yesware, ToutApp, and Mailtracker, which is only mobile
TrooMobile@johnhaden · New Product Junkie!
love this app... billing needs to get fixed, you'd think a company like HubSpot could figure it out, but really like this app.